• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.1
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• pp.121-127
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• 2010

This paper relates with the improved CMA blind adaptive equalization algorithm which uses the constellation matching method that improve the inverse modelling efficiency of a communication channel compared to the present CMA blind adaptive equalizer. The amplitude distortion can be compensated in the present CMA blind adaptive equalizer which is used for the reduction of intersymbol interference by distortion that generate such as a band limited wireless mobile channel, but in the improved adaptive alogorithm operates with the minimize the amplitude phase distortion in the output of equalizer by applying the cost function that is composition of additional signal constellation matching error terms. In order to evaluation of the inverse modeling efficiency of improved algorithm, the residual intersymbol interference and recovered signal constellation were compared by computer simulation. As a result of comparion of computer simulation, the improved algorithm has a good stability in the residual intersymbol interference in the steady state, but it has a slow convergence rate in the adaptation state in initial state.

• Journal of Internet Computing and Services
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• v.17 no.4
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• pp.19-26
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• 2016

In this paper, the dynamic buffering based smart OTT platform was proposed, and analyzed for adaptive bit-rate video delivery with the optimization of HLS (HTTP Live Streaming). This platform consists of the software platform between sever and client which detects the bandwidth capacity, and adjusts the quality of the streaming for multiple bit-rates resolutions. In order to apply adaptive buffering, two buffers are added to the basic HLS player, and each buffer is responsible for constantly buffering a previous and the next channels relative to the current channel. This adaptive transmitting with smart OTT platform is superior to delivering a static video file at a single buffering, because the video stream of adaptive double buffers can be switched streaming according to client's available network speed. As a result, this proposed smart OTT can be cooperated to the application of HLS server with segmented H.265 MPEG-2 TS video & m3u8 files with its information based on the optimized transmission channel state of live and VOD, and applied to PLC transmission, too.

• The KIPS Transactions:PartD
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• v.15D no.3
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• pp.361-374
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• 2008

In the latest intelligent computing environments, the self-adaptive software, as new software paradigm, which modifies its own behavior in response to changes in its operating environment is needed. To develop the self-adaptive software, it is necessary to analyze and design the context of software as well as the structure and the behavior of software. We need more efforts for self-adaptive software development than for traditional software development because we need more activities and technologies like context modeling and adaptation to develop the self-adaptive software. In this paper, we present the product line architecture for self-adaptive software and templates of artifacts to improve the efficiency of development through a reuse methodology. The artifacts of the architecture support the systematic reuse activities of core assets by expressing the commonality and variability of product line.

• Proceedings of the Korean Society of Community Living Science Conference
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• 2009.09a
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• pp.80-80
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• 2009

한국사회가 저출산 고령화와 고학력화의 추세, 전지구화, 지식정보화라는 세계적인 흐름을 고려할 때 앞으로도 향후 지속적인 이주인구의 유입은 불가피한 실정이다. 특히 결혼이민자들은 한국사회에서 적응하기 위한 언어와 문화적 적응을 극복하지 못한 상태에서 그들 자녀들을 교육해야 되는 열악한 환경적인 문제에 봉착하게 된다. 더구나 다문화가족 자녀는 2008년 5월을 기준으로 58,007명으로 전체 외국인 주민의 6.5%를 차지하며 다문화가족의 자녀 중 6세 이하가 57.1%로 상당히 높은 비율을 차지함을 고려해볼 때 현재 초 중등학생들을 대상으로 하는 연구는 시사점이 크다고 하겠다. 특히 전남지역의 다문화가족은 전국 최고의 비율을 차지하고 있으며 총 5,919 가족 중 영유아기와 학령기에 포함되어 있는 다문화가족 자녀 재학생수는 1,479명으로 집계되고 있다(행정안전부, 2008). 이렇게 교육대상자로서 점점 증가하고 있는 다문화가족의 학생들이 전남지역에 상당수 집중되어 있다. 이렇게 유입되는 이주자 중 결혼이민으로 인한 그 자녀의 자아존중감과 학교생활적응은 주요한 사회문제로 대두되고 있다. 그간의 연구들의 대부분은 이주여성의 생활실태와 일상에서 겪는 다양한 문제점에 초점을 맞추고 있을 뿐 그들 가정의 자녀들에 대한 연구는 미흡한 편이다. 이 연구는 2차 사회화 과정에 결정적인 영향을 미치는 학교생활에서 다문화가족 학생들의 자아존중감과 학교생활적응에 관하여 전남 동부지역 일부를 초 중등교사들을 대상으로 어떻게 인지하고 있는지를 연구하였다. 연구방법은 교사들을 대상으로 구조화된 설문지를 이용하여 인구학적 특성, 다문화가족 학생들의 자아존중감 및 학교생활적응 관련 인식들을 조사하였다. 자료분석은 SPSS Win 12.0을 사용하여 빈도분석, t-test 및 일원배치 분산분석을 실시하였다. 교사의 성별, 학교급 별, 농촌과 도시지역, 학교규모, 학년, 교육경력에 따라 유의미한 차이가 있는 것으로 나타났다.

• Journal of KIISE
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• v.43 no.7
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• pp.827-833
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• 2016

HTTP Adaptive Streaming (HAS) is a technique that adapts its video quality to network conditions for providing Quality of Experience. In the HAS approach, a video content is encoded at multiple bitrates and the encoded video content is divided into several video segments. A HAS player estimates the network bandwidth and adjusts the video bitrate based on estimated bandwidth. However, the segment scheduler in the conventional HAS player requests video segments periodically without considering TCP. If the waiting duration for the next segment request is quite long, the TCP connection can be initialized and it restarts slow-start. Slow-start causes the reduction in TCP throughput and consequentially leads to low-quality video streaming. In this study, we propose a TCP-aware segment scheduling scheme to improve performance of HAS service. The proposed scheme adjusts request time for the next video request to prevent initialization of TCP connection and also considers the point of scheduling time. The simulation proves that our scheme improves the Quality of Service of the HAS service without buffer underflow issue.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.3
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• pp.443-448
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• 2022

This paper presents a subband affine projection algorithm with variable step size to improve convergence performance in adaptive filtering applications with long adaptive filters and highly correlated input signals. The proposed algorithm can obtain fast convergence speed and small steady-state error by using different step sizes for each adaptive sub-filter in the subband structure to which polyphase decomposition and noble identity are applied. The step size derived to minimize the mean square error of the adaptive filter at each update time shows better convergence performance than the existing algorithm using a variable step size. In order to confirm the convergence performance of the proposed algorithm, which is superior to the existing algorithm, computer simulations are performed for mean square deviation(MSD) for AR(1) and AR(2) colored input signals considering the system identification model.

• Journal of the Korea Convergence Society
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• v.13 no.2
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• pp.321-329
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• 2022

The purpose of this study was to identify the effects of positive psychological capital and resilience on adjustment of college life and to suggest strategies for improving the adjustment of college life of nursing students. Data were collected from September 10 to September 30, 2020 using a structural questionnaire, which was completed by 197 nursing students in G city. The data was analyzed using SPSS/WIN (Version 22.0). The factors affecting the adjustment of college life of nursing students included positive psychological capital (ß=.36, p<.001), subjective health status (ß=.22, p<.001), resilience (ß=.21, p=.024), and major satisfaction (ß=.11, p=.047). These factors accounted for 47.0% of the adjustment of college life (p<.001). It is important to find ways to improve the level of positive psychological capital of nursing students and there is a need to include education programs or practical interventions to strengthen positive psychological capital.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.8 no.4
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• pp.46-54
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• 1994

Exhbitlon hghting design be done aftrr due consideration of the photochermcal reaction and h ~ ~ i i tc~.fficits~ upn exposure to light. In this study the balanced judgement is as follows. The most light-susceptible material shouid be illu~stratrui less than 50[k] (illurnlnance-hours per year : 120, 000k.h)and the illuminance of moderately sensitive rriatcrinl k 200[1x] (illuminance hours per year : 480, 0001x.h). Moreover to minimize damage the sources of light shoulcl not only contribute as little as heat possible but remove ultraviolt radiation by filters. Also the sources of light must have good color rendering and low color temperature.

• Korean Journal of Adult Nursing
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• v.22 no.5
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• pp.552-560
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• 2010

Purpose: This study was designed to identify effects of self-esteem and health status on adaptation of elderly residents in facilities. Methods: The sample consisted of 151 elderly residents. The data collected from January to April 2010 were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients and stepwise multiple regression. Using instruments were self-esteem scale (SES) (Rosenberg, 1965), Korean health status measure for the elderly (KoHSME) (Shin et al, 2002), and nursing home adaptation scale (Lee, 2007). Results: The mean scores of self-esteem ($2.90{\pm}0.71$), health status ($2.15{\pm}0.53$) and adaptation ($2.98{\pm}0.44$) of elderly residents in facilities were above the average. Self-esteem was significantly varied according to religion, economic status and living expenses. Health status was significantly different according to age, disease and motivation of getting into the facilities. Adaptation was significantly different according to religion, satisfaction of facilities and decision maker of getting into the facilities. Significant correlations were found between self-esteem, health status and adaptation. Self-esteem and health status were influencing factors of adaptation (22.6%). Conclusion: These findings indicate that perceived self-esteem and health status may be requirements for promoting adaptation of elderly residents in facilities. These results could be utilized in the development of supportive programs for elderly adaptation.

• Korean Journal of Adult Nursing
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• v.19 no.3
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• pp.413-421
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• 2007

Purpose: The purpose of this study was to explain the relationship between fatigue and other variables(perceived health status, marital adjustment and stress), and define the main factors influencing fatigue in middle aged women. Methods: Data were collected by self-reported questionnaires from 212 middle aged women. Data analysis was done with the SPSS 11.0 pc+ program for descriptive statistics, Pearson correlation coefficients and stepwise multiple regression. Results: The mean score of fatigue was 2.30(${\pm}0.46$), perceived health status was 2.82(${\pm}0.68$), marital adjustment was 2.86(${\pm}0.44$), and stress was 2.43(${\pm}0.61$). There were significant correlations between fatigue and the other variables(r=.56-.21, p=.00). The major factors that affect fatigue in middle aged women were stress, perceived health status, and marital adjustment, which explained 35.2% of fatigue. Conclusion: These variables have an effect on middle aged women's fatigue. Therefore, these findings can provide the basis for the development of nursing interventions to manage fatigue.